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28 March 2024
 
  » arxiv » 1101.5615

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Nearly full spin polarization of the surface state on a topological insulator
Z.-H. Pan ; E. Vescovo ; A. V. Fedorov ; D. Gardner ; Y.S. Lee ; S. Chu ; G. D. Gu ; T. Valla ;
Date 28 Jan 2011
AbstractWe performed high resolution spin- and angle-resolved photoemission spectroscopy studies of the electronic structure and the spin texture on the surface of Bi$_2$Se$_3$, a model topological insulator. By tunning the photon energy, we found that the topological surface state is well separated from the bulk states in the vicinity of $k_z=Z$ plane of the bulk Brillouin zone. The spin-resolved measurements in that region indicate a very high degree of spin polarization of the surface state, $sim 0.75$, much higher than previously reported. Our results demonstrate that the topological surface state on Bi$_2$Se$_3$ is highly spin polarized and that the dominant factors limiting the polarization are mainly extrinsic.
Source arXiv, 1101.5615
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